The board game “Endeavor” (designed by a couple friends of mine) is another Europeans-colonise-and-exploit-the-world game, and they intended to put some of these issues on the table. I just googled up a discussion of how they addressed slavery in the game – the review is not 100% convinced they go it right but applauds the attempt. Worth a look…   http://www.popmatters.com/post/153435-/